It seems to also be focused entirely on reading speed and comprehension as the criteria. If I'm reading a single journal article, yeah, it probably doesn't make a difference. It's when you're staring at it for 5 hours at a time that it can take a toll on you.

However, the result of the study stands in stark contrast with the participants' subjective reaction. "Almost all of the participants stated that they liked reading a printed book best. This was the dominant subjective response, but it does not match the data obtained from the study," specifies Professor Dr. Matthias Schlesewsky, Head of the Research Group Neurocognition of Language Universals of the Department of English and Linguistics at Johannes Gutenberg University Mainz, who designed and conducted the study together with Professor Füssel. In fact, tablet PCs actually provide an advantage over e-ink readers and the printed page that is not consciously perceivable: the information is processed more easily when a tablet PC is employed. Furthermore, while there were no differences between the three media employed in terms of rates of reading by the younger participants, the older participants exhibited faster reading times when using the tablet PC.

I didn't offer an opinion either way, only an article that purports to be objective.

My personal experience is consistent with the findings, I prefer using a tablet; but not for the reasons stated. I use my tablet for many other things besides reading, it’s just that since I always have it with me, and so also use it to read.